Introduction
5
would also have the backup host Etherpoll address in its IP
address list.
Each remote EtherPoll sends its data to both the master and
backup polling host. If the master host fails, the backup host
should be programmed to take over the polling function. It
would sense a failure by noting that master host polls are
absent.
Other Features
UDP/IP Protocol
The EtherPoll uses the UDP/IP protocol. This is much more
efficient for a polling system than TCP/IP. Since most polled
SCADA systems use protocols that are error corrected, the
transport (EtherPoll IP network) doesn’t need to provide an
additional layer of error correction overhead.
Protocol Independent
The EtherPoll works well with any byte oriented asynchronous
SCADA protocol. It does not require getting “into” the
protocol blocks.
Protocol Conversion
The RS-232 device at the client end and the device at the server
end of a link do not have to use the same communications
parameters on the RS232 link (speed, parity, flow control). The
EtherPolls will convert the data to the correct parameters at
each end.
Upgradeable Firmware
Firmware upgrades are downloadable to the EtherPoll. The
utility program required for this, and the actual firmware
upgrades, are available from your dealer.
Summary of Contents for EtherPoll
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